Wii Sports Scoring Glitch

I’ve been playing Wii Sports for a few weeks now and my ongoing tennis score keeps rising. It got me wondering what the highest skill level score one could achieve on the game. A quick google search says that 2399 is the highest possible score you can get. I’m not quite there, but during my progress I noticed a glitch in the graph that shows you your progress. The graph actually isn’t large enough to contain the valid data points: